The restoration of a 1980's Williams Defender arcade machine
The Monitor [complete]
No screen = no picture to play the game on so our next challenge was to find a suitable screen to fit the cabinet.
The size is fairly standard at 19″ and a few chats to the helpful team on UKVAC offered up the following standard 19″ arcade screen on eBay for a nice price of £50.00 + shipping
The screen I got is a Wells-Gardener, whereas the original monitor was a Electrohome GO7, but luckily they are pin-out compatible with each other (Reference: Pinx’s restoration)
So now that the power supply is working (and tested!) let’s give it some power and see what we get….
Life! As you can see from the screen it’s just showing a lot of ‘junk’ at the moment, but the fact that the monitor comes on [as does the marquee at the top] means that the Power Supply Unit is kicking out the right power to make the monitor happy and working.
The screen of junk does (however) indicate that there is some problem with the boards powering the game that need fixing so that’s where to focus our efforts next…
Further References:
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about 10 years ago
By default Williams games, and definitely Defender, use Positive Sync (+VSync, +HSync)
The two Synchronisation connections, depending on the monitor the female connector pins 5 and 6 can actually be separated into a separate connector and connected to the alternative sync pins 9 and 10 of the monitor connector.
I believe to use the -Sync connectors found on standard Jamma monitors, you need to do the SCART sync hack as per Dave Langley’s notes here
http://www.robotron-2084.co.uk/techwilliams2jamma.html#video
about 10 years ago
Judder – According to your link there (and everything else I’ve seen on defender) Williams games use Positive horizontal and vertical sync, not negative. Defender should have all wires on the 6pin connector if it is a standard defender installation
about 10 years ago
Thanks Steve – that is indeed correct (and I’ve updated my comment).
The Well Gardner K7000 series monitor I have supports both +Sync and -Sync so I’m guessing the Defender CPU board I am using was modified to use -Sync when it was repaired / tested.
The standard Wells Gardner K7000 connector as you say is:
Red
Green
Blue
Ground
+V. Sync
+H. Sync
Ground
-V. Sync
-H. Sync
and here’s a link to the monitor manual for reference (K7000 series)
http://www.mikesarcade.com/arcade/monitors.html